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Application of biochar, compost and ZVI nanoparticles for the remediation of As, Cu, Pb and Zn polluted soil

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Abstract

Here we tested the capacity of zero valent iron nanoparticles (nZVI) combined with two organic amendments, namely, compost and biochar, to immobilize metal(oid)s such as As, Cu, Pb, and Zn. In addition, the effects of the amendments on the development of Brassica juncea L., a plant widely used for phytoremediation purposes, were also examined. To perform the experiments, pots containing polluted soil were treated with nZVI, compost-biochar, or a blend of compost-biochar-nZVI. Metal(oid)s availability and soil properties were evaluated after 15 and 75 days, and the height and weight of the plants were measured to determine development. The compost-biochar amendment showed excellent capacity to immobilize metals, but As availability was considerably increased. However, the addition of nZVI to the mixture corrected this effect considerably. In addition, soil treatment with nZVI alone led to a slight increase in Cu availability, which was not observed for the mixture with organic amendments. With respect to soil properties, the CEC and pH were enhanced by the compost-biochar amendment, thereby favoring plant growth. Nevertheless, the nanoparticles reduced the concentration of available P, which impaired plant growth to a certain extent. In conclusion, Fe-based nanoparticles combined with organic amendments emerge as powerful approaches to remediate soils contaminated by metals and metalloids.

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Abbreviations

CEC:

Effective cations exchange

ICP-OES:

Inductively coupled plasma optical emission spectrometry

NBS:

Nature-based solutions

nZVI:

Zero valent iron nanoparticles

P:

Available phosphorus

SEM-EDX:

Scanning electron microscope and energy dispersive X-ray spectroscopy

SFCC:

Soil fertility capability classification

TC:

Total carbon

TCLP:

Toxicity characteristics leaching procedure

TN:

Total nitrogen

ZVI:

Zero valent iron

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Acknowledgments

We would like to thank the Electronic Microscopy Unit of the Scientific and Technical Services of the University of Oviedo for technical support.

Funding

This work was supported by the research project NANOBIOWASH CTM2016-75894-P (AEI/FEDER, UE). Diego Baragaño obtained a grant from the “Formación del Profesorado Universitario” program, financed by the “Ministerio de Educación, Cultura y Deporte de España.”

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Correspondence to Diego Baragaño.

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The authors declare that they have no competing interests.

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Responsible editor: Zhihong Xu

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Baragaño, D., Forján, R., Fernández, B. et al. Application of biochar, compost and ZVI nanoparticles for the remediation of As, Cu, Pb and Zn polluted soil. Environ Sci Pollut Res 27, 33681–33691 (2020). https://doi.org/10.1007/s11356-020-09586-3

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  • DOI: https://doi.org/10.1007/s11356-020-09586-3

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